Dec. 3, 1946. j D _ A_ J, FORD MECHANICAL GRINDING STONE 2,412,141~ . Filed May 7, 1945 „WWW INVENTOR.` l 2,412,141 Patented Dec. 3, 1946 AUNITED STATES PATENT 2,412,141 OFFICE MECHANICAL GRINDING STONE Asa J. Ford, Kansas City, Kans. Application May 7, 1945, Serial No. 592,455 2 Claims. 1 This invention relates to grinding equipment of the type employed in sharpening tools, and the primary aim is the provision of such equipment wherein the abrading stone is moved through its path of travel by power driven elements, all to the end that the operator may hold the tool being sharpened in a stationary condition while the cutting edge is being formed thereon. One of the important objects of this invention is to provide a mechanical grinding stone, the 10 2 illustrated, and the same comprises a table, gen erally designated by the numeral I0, in the top of which is formed a cavity I2 for the reception of a number of gears I4, IB and I8 respectively. Gear I6 is intermediate gears I4 and I8 and is mounted upon a shaft 20 journalled in table I8 Vand extending vertically therethrough to a point beneath table I0 where bevel gear 22 is affixed thereto. This bevel gear 22 is in mesh with an other bevel gear 24 on shaft 26, journalled in bearing 28. A pulley wheel 30 on shaft 26 is the medium through which power may be applied to work bench where actuation of the movable parts the train of gears I4, I6 and I8. A V-belt may may be caused through the application of power be passed over pulley 30 and thence over a pulley from a small motor. Other objects of the invention include the pro 15 on a motor or other source of power, not here shown. vision of a grinding stone of the aforementioned Gears I4 and I8 each is providedwith a peg 32 type wherein the stone is held for travel through disposed eccentrically with respect to the center an orbital path; the support for the stone com of rotation and these Apegs project vertically and prises a housing for a train of gears specially de signed to motivate the stone; the stone may be 20 upwardly through openings 34 formed in a plat nature whereof permits mounting the same on a easily removed without manipulating set screws, clamps or other manually operable instrumental ities; the stone and its holder is positioned close to a supporting rail designed to steady the oper ator’s hand and the work; and the support for 25 form 36 constituting the top ~of the table. This platform 36 has a smooth, horizontal upper sur face over which holder 38 may ride when the grinding stone is in operation. Holder 38 has sockets 48 to receive the respective pegs 32 and a grinding stone 42 is secured in any suitable fash the stone is in the nature of a tablel adapted to house the gear train through the medium where ion to holder 38, to the end that the upper-surface thereof is presented for use. of power is applied. Other objects of the invention will appear dur A rail 44 is mounted on platform 36 and ex ing the course of the following specification, re 30 tends longitudinally along one edge thereof and ferring to the accompanying drawing, wherein: adjacent to stone 42 where the operator may con veniently employ the same as a rest for his hand Fig. 1 is a top plan view of the mechanical as the tool is held against stone 42. grinding stone embodying the present invention, parts being broken away for convenience of illus When power is applied the train of gears hav tration. 35 ing elements I 4 and I 8 therein will serve to rotate pegs 32 through like circular paths to smoothly Fig. 2 is a vertical longitudinal sectional view shift holder 38 and the stone 42 along a path of taken on line II-II of Fig. 1; and travel that is kindred to the path which is nor Fig. 3 is a fragmentary vertical central sec tional view showing the manner of connecting mally established by the tool when being sharp the equipment to a source of power. 40 ened through the conventional hand method. The operator need only hold the tool at the It is common knowledge that workmen have proper angle, whereupon stone 42 will function without the expenditure of the operator’s energy other than that required to hold the tool against tool being treated, is usually through a path of 45 the face of stone 42 with the required amount of pressure. travel substantially orbital or in part, arcuate. Advantages arising from a mechanical stone Unless the tool is held at a precise angle and with skill and knowledge, the edge created is not true grinder made as above described, will be obvious and the beveled portion is not of a form that pro to those skilled in the art, and they will likewise duces best results. . 50 understand that modifications may be made without departing from the spirit ofthe invention To overcome this “human” element and to in heretofore sharpened tools of all description by drawing the same over the surface of abrading stones and that the movement imparted to the sure uniformity of pressure, movement and re or scope of the appended claims. Having thus described the invention, what is sults, the mechanical grinding stone illustrated in the accompanying drawing has been designed. claimed as new and desired to be secured by Let Only the preferred form of the invention has been 55 ters Patent is: - 2,412,141 3 1. A mechanical grinding stone comprising a table having a flat, horizontal top provided with openings in the latter; agrinding stone slidably openings in the latter; a grinding stone slidably mounted on the table top and having sockets formed in the bottom thereof; a power driven shaft carried by the table; a train of gears be mounted on the table top and having sockets formed in the bottom thereof; a power driven shaft carried by the table; a train of gears be neath the table top; pins, eccentrically mounted neath the table top; pins, eccentrically mounted wardly through the openings in the table top and on at least two of the gears and projecting up on at least two of the gears and projecting up into the sockets of the stone holder; and struc wardly through the'openings in the tablel top `and into the sockets oÍf 'the stone holder; `and struc ture operatively interconnecting the shaft and the train of gears to rotate the pins whereby to slide the stone holder through an orbital path ture operatively `interconnecting 'the fshaft and the train‘o‘f gears to rotate Athe pins whereby to slide the stone holder through an orbital path over the table top, said table top having a sta tionary rail thereon adjacent to the stone holder for supporting the hands of the user as the grind over the table top. 2. A mechanical grinding stone comprising a '15 ing stone is being used. table having a flat, horizontal top provided with ASA J. FORD.